I have the Element Bolt and with multiple mounts use it on all five of my bikes. I have the pages setup for road and mtb use.
On my road bike I have the display showing mostly power numbers. Not so interested in speed. Heart rate is on along with HR zone.
When on mtb I have it showing speed and avg speed, heart rate, climbing distance etc. I mainly use HR and average speed to pace XCO rides or marathon up to 3 or 4 hours. I don’t yet have a PM on the XC bike but if I did I’d refer to the normalised power to aid pacing. Plenty of time to look at the screen while riding.
When enduro racing I have average speed and total time riding front and center so that I know how long I have left to make it to stages and ultimately the finish line.
I also bought the little tethering cable that screws into back of the unit which allows you to tie the head unit onto the handlebar. Won’t go missing in a crash.
In conclusion I find it most useful. During and after rides, on and off road. You do have plenty of time to look at it off road. Worthwhile purchase I feel.